Thank you for your responses. We stopped by West Marine in Dedham, and couldn't find Slimey Grimey or M.K.on-off. I was amazed that most of their cleaning products did not list ingredients. We spoke to someone there who pointed out that some of the products would clean fiberglass, but destroy the metal on the trailer.
We will stop by Winnisquam Marine before we go home today, to see if they carry S G
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